FelisSapien
Member
Hi All,
I've seen a lot of detailed talk problem solving this PSU but I haven't seen chat about quite what I'm experiencing... I have a UK Apple II Europlus. It's complete and cosmetically in pretty good condition. Alas, it doesn't work. I'm starting with the PSU... Firstly I switched out the Rifa caps. After this I reviewed the output and found very low values. After this I replaced the electrolytic capacitors. For a short while this seemed to do the trick. I measured close to the expected +5, +15, -5 and -12. But after a few minutes C20 (660uf 16V) blew. I replaced this capacitor again and the same thing happened again. So I'm guessing too much current is hitting C20? My problem is that although I'm reasonably comfortable replacing like for like components I'm don't have any real experience with power supplies. Is anyone able to help me track back to the cause of the issue?
I have another question around the power supply - as I received it the on/off switch had been bypassed. I removed it and found that on continuity it tests out ok. When in place though it sounds as though it's internals are shorting when switching from on to off and vice-versa. Is this a 'standard' part? I've looked around for a rocker switch around the same size and haven't come across anything quite the same spec. Do I have any hope of pulling the switch I have apart and reassembling?
Thanks in advance,
Carl
I've seen a lot of detailed talk problem solving this PSU but I haven't seen chat about quite what I'm experiencing... I have a UK Apple II Europlus. It's complete and cosmetically in pretty good condition. Alas, it doesn't work. I'm starting with the PSU... Firstly I switched out the Rifa caps. After this I reviewed the output and found very low values. After this I replaced the electrolytic capacitors. For a short while this seemed to do the trick. I measured close to the expected +5, +15, -5 and -12. But after a few minutes C20 (660uf 16V) blew. I replaced this capacitor again and the same thing happened again. So I'm guessing too much current is hitting C20? My problem is that although I'm reasonably comfortable replacing like for like components I'm don't have any real experience with power supplies. Is anyone able to help me track back to the cause of the issue?
I have another question around the power supply - as I received it the on/off switch had been bypassed. I removed it and found that on continuity it tests out ok. When in place though it sounds as though it's internals are shorting when switching from on to off and vice-versa. Is this a 'standard' part? I've looked around for a rocker switch around the same size and haven't come across anything quite the same spec. Do I have any hope of pulling the switch I have apart and reassembling?
Thanks in advance,
Carl